/Engine/Source/Runtime/GeometryCore/Public/CompGeom/ConvexHull3.h
Only valid if bSaveTriangleNeighbors was true whenSolve()was called
Neighbors of each hull triangle, in edge order  i.e., Nbr.A is the triangle across edge(Tri.A, Tri.B)
[TArray](API\Runtime\Core\Containers\TArray)< [FIndex3i](API\Runtime\GeometryCore\FIndex3i) > const & GetTriangleNeighbors() const